9 found
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  1.  6
    Effects of Polygyny and Consanguinity on High Fertility in the Rural Arab Population in South Jordan.Shuji Sueyoshi & Ryutaro Ohtsuka - 2003 - Journal of Biosocial Science 35 (4):513-526.
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  2.  26
    Significant Effects of Birth-Related Biological Factors on Pre-Adolescent Nutritional Status Among Rural Sundanese in West Java, Indonesia.Makiko Sekiyama & Ryutaro Ohtsuka - 2005 - Journal of Biosocial Science 37 (4):413-426.
    The Sundanese inhabiting West Java, the second largest ethnic group in Indonesia, are characterized by a high prevalence of child malnutrition, together with high fertility. Based on an anthropometric measurement and interview survey of 310 children aged 5s body weight, and one SES factor, i.e. mother’s occupation, were selected as the predictors of the two Z scores by regression analysis, indicating more significant effects of the biological factors than the other factors. This pattern is judged to occur in less-developed and (...)
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  3.  20
    Effects of Oral Contraceptive Use on Body Mass Index and Blood Pressure Among Female Villagers in North-East Thailand.Nobuko Murayama, Ayu Matsunaga, Ladda Tangbanluekal, Suwalee Tantawiwat & Ryutaro Ohtsuka - 2003 - Journal of Biosocial Science 35 (2):243-261.
    The use of contraceptives has become prevalent among females in Thailand in the past 20 years, and oral contraceptive use has been suggested to trigger changes in fat intake, energy expenditure, fat metabolism and blood pressure. Based on field investigations of 391 married women aged 20 years or over in Yasothon Province, North-east Thailand, this study aims to elucidate the effects of oral contraceptive use on body mass index (BMI: kg/m2 ) and blood pressure, taking into account reproductive histories and (...)
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  4.  11
    Time Allocation to Subsistence Activities Among the Huli in Rural and Urban Papua New Guinea.Masahiro Umezaki, Taro Yamauchi & Ryutaro Ohtsuka - 2002 - Journal of Biosocial Science 34 (1):133-138.
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  5.  9
    Gender Difference in Daily Time and Space Use Among Bangladeshi Villagers Under Arsenic Hazard: Application of the Compact Spot-Check Method.Ryutaro Ohtsuka, Noriko Sudo, Makiko Sekiyama, Chiho Watanabe, Tsukasa Inaoka & Takafumi Kadono - 2004 - Journal of Biosocial Science 36 (3):317-332.
  6.  7
    Twenty Years’ Demographic Change in Sedentes and Migrants of an International Migrant-Sending Community in Tonga.Shoko Fukuyama, Chiho Watanabe, Masahiro Umezaki & Ryutaro Ohtsuka - 2009 - Journal of Biosocial Science 41 (1):77.
  7.  6
    Daily Time Budgets of Long‐Distance Commuting Workers in Tokyo Megalopolis.Masahiro Umezaki, Hitoshi Ishimaru & Ryutaro Ohtsuka - 1999 - Journal of Biosocial Science 31 (1):71-78.
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  8.  5
    Impact of Rural‐Urban Migration on Fertility: A Population Ecology Analysis in the Kombio, Papua New Guinea.Masahiro Umezaki & Ryutaro Ohtsuka - 1998 - Journal of Biosocial Science 30 (3):411-422.
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  9.  2
    Subsistence Ecology and Carrying Capacity in Two Papua New Guinea Populations.Ryutaro Ohtsuka - 1994 - Journal of Biosocial Science 26 (3):395-407.
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